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Apart from the blood, studies suggest that hemoglobin may also play some unexpected roles in other tissues

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Wu G-Y, Deisseroth K, Tsien RW (2001) Activity-dependent CREB phosphorylation: convergence of a fast, sensitive calmodulin kinase pathway and a slow, less sensitive mitogen-activated protein kinase pathway

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However, other resting-state quantitative EEG (qEEG) features, including spectral power and functional connectivity, showed no robust ability to differentiate tinnitus laterality after rigorous statistical correction, highlighting the challenge of identifying reliable electrophysiological biomarkers (Kim S